/*
 * CodePress - Real Time Syntax Highlighting Editor written in JavaScript - http://codepress.org/
 * 
 * Copyright (C) 2007 Fernando M.A.d.S. <fermads@gmail.com>
 *
 * Developers:
 *    Fernando M.A.d.S. <fermads@gmail.com>
 *    Michael Hurni <michael.hurni@gmail.com>
 * Contributors:  
 *    Martin D. Kirk
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the 
 * GNU Lesser General Public License as published by the Free Software Foundation.
 * 
 * Read the full licence: http://www.opensource.org/licenses/lgpl-license.php
 */

CodePress = {
  scrolling : false,
  autocomplete : true,

  // set initial vars and start sh
  initialize : function() {
    if(typeof(editor)=='undefined' && !arguments[0]) return;
    body = document.getElementsByTagName('body')[0];
    body.innerHTML = body.innerHTML.replace(/\n/g,"");
    chars = '|32|46|62|8|'; // charcodes that trigger syntax highlighting
    cc = '\u2009'; // carret char
    editor = document.getElementsByTagName('pre')[0];
    document.designMode = 'on';
    document.addEventListener('keypress', this.keyHandler, true);
    window.addEventListener('scroll', function() { if(!CodePress.scrolling) CodePress.syntaxHighlight('scroll') }, false);
    completeChars = this.getCompleteChars();
    completeEndingChars =  this.getCompleteEndingChars();
  },

  // treat key bindings
  keyHandler : function(evt) {
      keyCode = evt.keyCode;  
    charCode = evt.charCode;
    fromChar = String.fromCharCode(charCode);

    if((evt.ctrlKey || evt.metaKey) && evt.shiftKey && charCode!=90)  { // shortcuts = ctrl||appleKey+shift+key!=z(undo) 
      CodePress.shortcuts(charCode?charCode:keyCode);
    }
    else if( (completeEndingChars.indexOf('|'+fromChar+'|')!= -1 || completeChars.indexOf('|'+fromChar+'|')!=-1) && CodePress.autocomplete) { // auto complete
      if(!CodePress.completeEnding(fromChar))
           CodePress.complete(fromChar);
    }
      else if(chars.indexOf('|'+charCode+'|')!=-1||keyCode==13) { // syntax highlighting
      top.setTimeout(function(){CodePress.syntaxHighlight('generic');},100);
    }
    else if(keyCode==9 || evt.tabKey) {  // snippets activation (tab)
      CodePress.snippets(evt);
    }
    else if(keyCode==46||keyCode==8) { // save to history when delete or backspace pressed
      CodePress.actions.history[CodePress.actions.next()] = editor.innerHTML;
    }
    else if((charCode==122||charCode==121||charCode==90) && evt.ctrlKey) { // undo and redo
      (charCode==121||evt.shiftKey) ? CodePress.actions.redo() :  CodePress.actions.undo(); 
      evt.preventDefault();
    }
    else if(charCode==118 && evt.ctrlKey)  { // handle paste
      top.setTimeout(function(){CodePress.syntaxHighlight('generic');},100);
    }
    else if(charCode==99 && evt.ctrlKey)  { // handle cut
      //alert(window.getSelection().getRangeAt(0).toString().replace(/\t/g,'FFF'));
    }

  },

  // put cursor back to its original position after every parsing
  findString : function() {
    if(self.find(cc))
      window.getSelection().getRangeAt(0).deleteContents();
  },
  
  // split big files, highlighting parts of it
  split : function(code,flag) {
    if(flag=='scroll') {
      this.scrolling = true;
      return code;
    }
    else {
      this.scrolling = false;
      mid = code.indexOf(cc);
      if(mid-2000<0) {ini=0;end=4000;}
      else if(mid+2000>code.length) {ini=code.length-4000;end=code.length;}
      else {ini=mid-2000;end=mid+2000;}
      code = code.substring(ini,end);
      return code;
    }
  },
  
  getEditor : function() {
    if(!document.getElementsByTagName('pre')[0]) {
      body = document.getElementsByTagName('body')[0];
      if(!body.innerHTML) return body;
      if(body.innerHTML=="<br>") body.innerHTML = "<pre> </pre>";
      else body.innerHTML = "<pre>"+body.innerHTML+"</pre>";
    }
    return document.getElementsByTagName('pre')[0];
  },
  
  // syntax highlighting parser
  syntaxHighlight : function(flag) {
    //if(document.designMode=='off') document.designMode='on'
    if(flag != 'init') { window.getSelection().getRangeAt(0).insertNode(document.createTextNode(cc));}
    editor = CodePress.getEditor();
    o = editor.innerHTML;
    o = o.replace(/<br>/g,'\n');
    o = o.replace(/<.*?>/g,'');
    x = z = this.split(o,flag);
    x = x.replace(/\n/g,'<br>');

    if(arguments[1]&&arguments[2]) x = x.replace(arguments[1],arguments[2]);
  
    for(i=0;i<Language.syntax.length;i++)
      x = x.replace(Language.syntax[i].input,Language.syntax[i].output);

    editor.innerHTML = this.actions.history[this.actions.next()] = (flag=='scroll') ? x : o.split(z).join(x);
    if(flag!='init') this.findString();
  },
  
  getLastWord : function() {
    var rangeAndCaret = CodePress.getRangeAndCaret();
    words = rangeAndCaret[0].substring(rangeAndCaret[1]-40,rangeAndCaret[1]);
    words = words.replace(/[\s\n\r\);\W]/g,'\n').split('\n');
    return words[words.length-1].replace(/[\W]/gi,'').toLowerCase();
  },
  
  snippets : function(evt) {
    var snippets = Language.snippets; 
    var trigger = this.getLastWord();
    for (var i=0; i<snippets.length; i++) {
      if(snippets[i].input == trigger) {
        var content = snippets[i].output.replace(/</g,'&lt;');
        content = content.replace(/>/g,'&gt;');
        if(content.indexOf('$0')<0) content += cc;
        else content = content.replace(/\$0/,cc);
        content = content.replace(/\n/g,'<br>');
        var pattern = new RegExp(trigger+cc,'gi');
        evt.preventDefault(); // prevent the tab key from being added
        this.syntaxHighlight('snippets',pattern,content);
      }
    }
  },
  
  readOnly : function() {
    document.designMode = (arguments[0]) ? 'off' : 'on';
  },

  complete : function(trigger) {
    window.getSelection().getRangeAt(0).deleteContents();
    var complete = Language.complete;
    for (var i=0; i<complete.length; i++) {
      if(complete[i].input == trigger) {
        var pattern = new RegExp('\\'+trigger+cc);
        var content = complete[i].output.replace(/\$0/g,cc);
        parent.setTimeout(function () { CodePress.syntaxHighlight('complete',pattern,content)},0); // wait for char to appear on screen
      }
    }
  },

  getCompleteChars : function() {
    var cChars = '';
    for(var i=0;i<Language.complete.length;i++)
      cChars += '|'+Language.complete[i].input;
    return cChars+'|';
  },
  
  getCompleteEndingChars : function() {
    var cChars = '';
    for(var i=0;i<Language.complete.length;i++)
      cChars += '|'+Language.complete[i].output.charAt(Language.complete[i].output.length-1);
    return cChars+'|';
  },
  
  completeEnding : function(trigger) {
    var range = window.getSelection().getRangeAt(0);
    try {
      range.setEnd(range.endContainer, range.endOffset+1)
    }
    catch(e) {
      return false;
    }
    var next_character = range.toString()
    range.setEnd(range.endContainer, range.endOffset-1)
    if(next_character != trigger) return false;
    else {
      range.setEnd(range.endContainer, range.endOffset+1)
      range.deleteContents();
      return true;
    }
  },
  
  shortcuts : function() {
    var cCode = arguments[0];
    if(cCode==13) cCode = '[enter]';
    else if(cCode==32) cCode = '[space]';
    else cCode = '['+String.fromCharCode(charCode).toLowerCase()+']';
    for(var i=0;i<Language.shortcuts.length;i++)
      if(Language.shortcuts[i].input == cCode)
        this.insertCode(Language.shortcuts[i].output,false);
  },
  
  getRangeAndCaret : function() { 
    var range = window.getSelection().getRangeAt(0);
    var range2 = range.cloneRange();
    var node = range.endContainer;      
    var caret = range.endOffset;
    range2.selectNode(node);  
    return [range2.toString(),caret];
  },
  
  insertCode : function(code,replaceCursorBefore) {
    var range = window.getSelection().getRangeAt(0);
    var node = window.document.createTextNode(code);
    var selct = window.getSelection();
    var range2 = range.cloneRange();
    // Insert text at cursor position
    selct.removeAllRanges();
    range.deleteContents();
    range.insertNode(node);
    // Move the cursor to the end of text
    range2.selectNode(node);    
    range2.collapse(replaceCursorBefore);
    selct.removeAllRanges();
    selct.addRange(range2);
  },
  
  // get code from editor
  getCode : function() {
    if(!document.getElementsByTagName('pre')[0] || editor.innerHTML == '')
      editor = CodePress.getEditor();
    var code = editor.innerHTML;
    code = code.replace(/<br>/g,'\n');
    code = code.replace(/\u2009/g,'');
    code = code.replace(/<.*?>/g,'');
    code = code.replace(/&lt;/g,'<');
    code = code.replace(/&gt;/g,'>');
    code = code.replace(/&nbsp;/gi,' ');
    code = code.replace(/&amp;/gi,'&');
    return code;
  },

  // put code inside editor
  setCode : function() {
    var code = arguments[0];
    code = code.replace(/\u2009/gi,'');
    code = code.replace(/&/gi,'&amp;');
    code = code.replace(/</g,'&lt;');
    code = code.replace(/>/g,'&gt;');
    editor.innerHTML = code;
    if (code == '')
      document.getElementsByTagName('body')[0].innerHTML = '';
  },

  // undo and redo methods
  actions : {
    pos : -1, // actual history position
    history : [], // history vector
    
    undo : function() {
      editor = CodePress.getEditor();
      if(editor.innerHTML.indexOf(cc)==-1){
        if(editor.innerHTML != " ")
          window.getSelection().getRangeAt(0).insertNode(document.createTextNode(cc));
        this.history[this.pos] = editor.innerHTML;
      }
      this.pos --;
      if(typeof(this.history[this.pos])=='undefined') this.pos ++;
      editor.innerHTML = this.history[this.pos];
      if(editor.innerHTML.indexOf(cc)>-1) editor.innerHTML+=cc;
      CodePress.findString();
    },
    
    redo : function() {
      // editor = CodePress.getEditor();
      this.pos++;
      if(typeof(this.history[this.pos])=='undefined') this.pos--;
      editor.innerHTML = this.history[this.pos];
      CodePress.findString();
    },
    
    next : function() { // get next vector position and clean old ones
      if(this.pos>20) this.history[this.pos-21] = undefined;
      return ++this.pos;
    }
  }
}

Language={};
window.addEventListener('load', function() { CodePress.initialize('new'); }, true);
